Which scientist invented the very first optical microscopes and was also the first person to view single-celled organisms living in pond water? a) robert hooke b) theodor schwann c) mattias schleiden d) anton von leeuwenhoek

The correct answer is option D, that is, Anton Von Leeuwenhoek.  

Anton Von Leeuwenhoek was the first individual to witness living cells. In 1675, he observed a single cell species in a drop of water. These living organisms were microscopic and could only be observed with the help of a microscope.  

Leeuwenhoek was the first person to discover the living cell, as the cell witnessed by Robert Hooke provided no clue of the nucleus and another organelle within the cell. Leeuwenhoek was the first man who found a living cell and observed it under a microscope, providing an indication about the nucleus and all the protoplasmic organelle found in the cell.  

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.